Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Behaviour of Cd, Cr, Mn, Ni, Pb, and Zn in sewage sludge incineration by fluidised bed furnace |
| Abstract | Cd, Cr, Mn, Ni, Pb, and Zn behaviour during sewage sludge incineration was investigated in seven pilot tests using a circulating fluidised bed furnace. Dewatered sludge at a solids concentration of 1518% was fed to the furnace either alone (two tests) or spiked with chlorinated organic compounds (five tests). The behaviour of metals in the fluidised bed furnace was studied by comparing metal concentrations in the two main ash streams: ash separated from the cyclone immediately following the fluidised bed furnace, and fly ash recovered in the final bag filter. A metal enrichment factor was defined as the ratio of metal concentration between filter ash and cyclone ash. Only Cd and Pb showed any significant enrichment. Their enrichment factors were mainly affected by chlorine concentration in the feed sludge. To check whether simple equilibrium models may explain and predict metal behaviour, experimental data were compared with percentage of the metal vaporisation in the combustion chamber predicted using a thermodynamic model. Discrepancies between model predictions and experimental results are accounted for by considering that kinetics may be a limiting factor in the formation of metal chloride gaseous species. Due to the very short sludge residence time in the fluidised bed furnace, the gaseous compounds have little chance to evolve completely |
| Source | Waste management (Elmsford) 23, pp. 117–124 |
| Keywords | sewagesludge incinerationfluidised bed furnacefly ashheavy metal partitioning |
| Journal | Waste management (Elmsford) |
| Editor | Pergamon Press,, New York, Stati Uniti d'America |
| Year | 2003 |
| Type | Articolo in rivista |
| Authors | MARANI D., BRAGUGLIA C.M., MININNI G., MACCIONI F. |
| Text | 42074 2003 sewage sludge incineration fluidised bed furnace fly ash heavy metal partitioning Behaviour of Cd, Cr, Mn, Ni, Pb, and Zn in sewage sludge incineration by fluidised bed furnace MARANI D., BRAGUGLIA C.M., MININNI G., MACCIONI F. 1,2,3 CNR Istituto di Ricerca sulle Acque. 4 Universita di Roma La Sapienza Cd, Cr, Mn, Ni, Pb, and Zn behaviour during sewage sludge incineration was investigated in seven pilot tests using a circulating fluidised bed furnace. Dewatered sludge at a solids concentration of 1518% was fed to the furnace either alone two tests or spiked with chlorinated organic compounds five tests . The behaviour of metals in the fluidised bed furnace was studied by comparing metal concentrations in the two main ash streams ash separated from the cyclone immediately following the fluidised bed furnace, and fly ash recovered in the final bag filter. A metal enrichment factor was defined as the ratio of metal concentration between filter ash and cyclone ash. Only Cd and Pb showed any significant enrichment. Their enrichment factors were mainly affected by chlorine concentration in the feed sludge. To check whether simple equilibrium models may explain and predict metal behaviour, experimental data were compared with percentage of the metal vaporisation in the combustion chamber predicted using a thermodynamic model. Discrepancies between model predictions and experimental results are accounted for by considering that kinetics may be a limiting factor in the formation of metal chloride gaseous species. Due to the very short sludge residence time in the fluidised bed furnace, the gaseous compounds have little chance to evolve completely 23 Articolo in rivista Pergamon Press, 0956 053X Waste management Elmsford Waste management Elmsford Waste management. Elmsford camillamaria.braguglia BRAGUGLIA CAMILLA MARIA dario.marani MARANI DARIO giuseppe.mininni MININNI GIUSEPPE |